<template>
  <div class = "goods">
    <div
      class = "menu-wrapper"
      ref = "menuWrapper">
      <ul>
        <li
          v-for = "(item, index) in goods" :key = "index"
          class = "menu-item"
          :class = "{'current':contentIndex===index}"
          @click = "selectMenu(index, $event)">
          <span class = "text border-1px">
            <span
              v-show = "item.type > 0"
              class = "icon"
              :class = "classMap[item.type]"></span
            ><span class = "content">
              {{ item.name }}
            </span>
          </span>
        </li>
      </ul>
    </div>
    <div
      class = "foods-wrapper"
      ref = "foodsWrapper">
      <ul>
        <li
          v-for = "(item, index) in goods" :key = "index"
          class = "foods-list foods-list-hook">
          <h1 class = "title">{{ item.name }}</h1>
          <ul>
            <li
              v-for = "(food, index) in item.foods" :key = "index"
              @click = 'selectedFood(food)'
              class = "foods-item border-1px">
              <div class = "icon">
                <img
                  :src = "food.icon"
                  width = "57"
                  height = "57">
              </div>
              <div class = "content">
                <h2 class = "name">{{ food.name }}</h2>
                <p class = "desc">{{ food.description }}</p>
                <div class = "extra">
                  <span class = "count left">月售{{ food.sellCount }}份
                  </span><span class = "count">好评率{{ food.rating }}%</span>
                </div>
                <div class = "price">
                  <span class = "now">¥{{ food.price }}</span><span
                  class = "old"
                  v-show = "food.oldPrice">¥{{ food.oldPrice }}</span>
                </div>
                <div class = 'cartcontrol-wrapper'>
                  <cartcontrol
                    @addCart = 'addCart'
                    :food = 'food'></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart
      ref = "shopCart"
      :select-foods = 'selectFoods'
      :delivery-price = 'seller.deliveryPrice'
      :min-price = 'seller.minPrice'></shopcart>
    <food @addCart = 'addCart' :food = 'selectFood' ref = 'food'></food>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import shopcart from '@/components/shopcart/shopcart'
import cartcontrol from '@/components/cartcontrol/cartcontrol'
import food from '@/components/food/food'

export default {
  components: {
    shopcart,
    cartcontrol,
    food,
  },
  props: {
    seller: {
      type: Object,
    },
  },
  data() {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectFood: {},
    }
  },
  watch: {},
  computed: {
    contentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let item1 = this.listHeight[i]
        let item2 = this.listHeight[i + 1]
        if (!item2 || (this.scrollY >= item1 && this.scrollY < item2)) {
          return i
        }
      }
      return 0
    },
    selectFoods() {
      let foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count > 0) {
            foods.push(food)
          }
        })
      })
      return foods
    },
  },
  methods: {
    selectMenu(index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('foods-list-hook')
      let el = foodList[index]
      this.foodScroll.scrollToElement(el, 300)
    },
    selectedFood(food) {
      this.selectFood = food
      this.$refs.food.show()
    },
    addCart(target) {
      this.$refs.shopCart.darp(target)
    },
    _initScroll() {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true,
      })
      this.foodScroll = new BScroll(this.$refs.foodsWrapper, {
        click: true,
        probeType: 3,
      })
      this.foodScroll.on('scroll', (pos) => {
        let yf = pos.y
        this.scrollY = Math.abs(Math.round(yf))
      })
    },
    _calculateHeight() {
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('foods-list-hook')
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    },
  },
  created() {
    this.$nextTick(function () {
      this.classMap = ['decrease', 'discount', 'invoice', 'guarantee', 'special']
      this.$axios
        .get('/api/goods', {})
        .then(res => {
          this.goods = res.data.data
          console.log(this.goods)
          this.$nextTick(() => {
            this._initScroll()
            this._calculateHeight()
          })
        })
        .catch(err => {
          console.log(err)
        })
    })
  },
  mounted() {
  },

}
</script>
<style lang = "stylus" scoped>
  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        line-height: 14px
        padding: 0 12px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          background-size: 12px 12px
          margin-right: 2px
          background-repeat: no-repeat
          &.decrease
            bg-image('../header/decrease_1')
          &.discount
            bg-image('../header/discount_1')
          &.invoice
            bg-image('../header/invoice_1')
          &.guarantee
            bg-image('../header/guarantee_1')
          &.special
            bg-image('../header/special_1')
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .foods-item
        display: flex
        padding-bottom: 18px
        margin: 18px
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          font-size: 0
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            color: rgb(147, 153, 159)
          .desc
            line-height: 12px
            font-size: 10px
            margin-bottom: 8px
          .extra
            .count
              font-size: 10px
              &.left
                margin-right: 12px
          .price
            height: 24px
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 12px


</style>
